Malicious PDF — malware analysis report

Static analysis result for SHA-256 607931e21260ac3a…

MALICIOUS

PDF

120.0 KB Created: 2021-07-16 05:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c66dff20860a9bb8fe1321931f01a9f9 SHA-1: a043c0ee0bcbdec91f18b7d93c8f82d6194847e6 SHA-256: 607931e21260ac3a4e5878edff2e6eaab7ed5619c2c7787e79a9e624cedfdec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads, aligning with the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=the+witcher+3+ladies+of+the+wood+tree PDF link annotation
    • https://ckd-otto.com/contents//files/kolitidivuxusotusadax.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/u4hrghgccbggspi5h2831kls8c/nurusimigajiwipoxepi.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a6c43af6793fd34d1a277fe503f2dd45/63776532113.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/4d77dd7c6c63bf2df05f35ed3e730bd4/89580699673.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdba029997---61989129257.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/25233335522.pdfIn PDF document text
    • http://bociany.sk/media/file/tebaloloses.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0855854d67cacff00a371b84349ebe2e/14076107818.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607731180274f---65993561699.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/afjak5ievb28gtuve3ha8h48qk/47466200260.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/5905667258.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/000a7eb789c7a000e28e216f0d370677/manonam.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/11168558337.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074596bca8d6---12839252989.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/tubigigu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0bbfdcc799afd24c726524fccdf1ee6d/zebebigijidokitoxosidawe.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160869a0761a87---xudufutuvus.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/norogutoweta.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/vuzetuwefewevuvawiw.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cecd78f0e5c---xagexusizeveripuxisumusu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/dumafekujul.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160778c931504d---gipilawoxubilikonuzepi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/skacjhhdc5aqp2p66k2o2q6754/44426319425.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/basemizefinur.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000151e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000169f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169F4 18680 bytes
SHA-256: 727fb79969239fbeedfd7ca55505fa3ac579fd030bde641751090f494fe8bf48
font_02_sfnt_off00019b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B51 18432 bytes
SHA-256: 5431423a30679e7a10e5b17e0d5a367dca94bda10bcc19acdd8346fe153e445e
font_03_sfnt_off0001b926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B926 10688 bytes
SHA-256: 91133c64c7bde032d8c9a07097e9e4f1da0b2d7556bea8d60d649f55e95d542a

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